I've seen in several occasions many people using the comparative adjective "madder".
Like in saying "I'm mad at him. But if he didn't ask I'll be even madder."
This "madder" just doesn't sound correct to my ears .. so what do you think?
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It sounds fine to me. You aren't the only one to doubt the word, though. See: Twitter Users Call Out President Obama Because “Madder” Isn’t a Word, Except That it Is.
This might be a relative cultural thing, based on where you grow up. An example of what I mean is people pronouncing ask as if it were aks (or, what I hear, axe). It sounds totally ignorant to my ears, but apparently in parts of the American Northeast the usage is quite common even among well-educated people.